40 CFR Part 63, Table 1
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| CAS No.a | Compound name | Fm 305 |
|---|---|---|
| 75070 | Acetaldehyde | 1 |
| 75058 | Acetonitrile | 0.989 |
| 98862 | Acetophenone | 0.314 |
| 98862 | Acetophenone | 0.314 |
| 107028 | Acrolein | 1 |
| 107131 | Acrylonitrile | 0.999 |
| 107051 | Allyl chloride | 1 |
| 71432 | Benzene (includes benzene in gasoline) | 1 |
| 98077 | Benzotrichloride (isomers and mixture) | 0.958 |
| 100447 | Benzyl chloride | 1 |
| 92524 | Biphenyl | 0.864 |
| 542881 | Bis(chloromethyl)ether b | 0.999 |
| 75252 | Bromoform | 0.998 |
| 106990 | 1,3-Butadiene | 1 |
| 75150 | Carbon disulfide | 1 |
| 56235 | Carbon Tetrachloride | 1 |
| 43581 | Carbonyl sulfide | 1 |
| 133904 | Chloramben | 0.633 |
| 108907 | Chlorobenzene | 1 |
| 67663 | Chloroform | 1 |
| 107302 | Chloromethyl methyl ether b | 1 |
| 126998 | Chloroprene | 1 |
| 98828 | Cumene | 1 |
| 94757 | 2,4-D, salts and esters | 0.167 |
| 334883 | Diazomethane c | 0.999 |
| 132649 | Dibenzofurans | 0.967 |
| 96128 | B1,2-Dibromo-3-chloropropane | 1 |
| 106467 | 1,4-Dichlorobenzene(p) | 1 |
| 107062 | Dichloroethane (Ethylene dichloride) | 1 |
| 111444 | Dichloroethyl ether (Bis(2-chloroethylether) | 0.757 |
| 542756 | 1,3-Dichloropropene | 1 |
| 64675 | Diethyl sulfate | 0.0025 |
| 79447 | Dimethyl carbamoyl chloride c | 0.15 |
| 77781 | Dimethyl sulfate | 0.086 |
| 121697 | N,N-Dimethylaniline | 0.0008 |
| 51285 | 2,4-Dinitrophenol | 0.0077 |
| 121142 | 2,4-Dinitrotoluene | 0.0848 |
| 123911 | 1,4-Dioxane (1,4-Diethyleneoxide) | 0.869 |
| 106898 | Epichlorohydrin (1-Chloro-2,3-epoxypropane) | 0.939 |
| 106887 | 1,2-Epoxybutane | 1 |
| 140885 | Ethyl acrylate | 1 |
| 100414 | Ethyl benzene | 1 |
| 75003 | Ethyl chloride (Chloroethane) | 1 |
| 106934 | Ethylene dibromide (Dibromoethane) | 0.999 |
| 107062 | Ethylene dichloride (1,2-Dichloroethane) | 1 |
| 151564 | Ethylene imine (Aziridine) | 0.867 |
| 75218 | Ethylene oxide | 1 |
| 75343 | Ethylidene dichloride (1,1-Dichloroethane) Glycol ethers d that have a Henry's Law Constant value equal to or greater than 0.01 Y/X(1.8 × 10−6 atm/gm-mole/m3) at 25 °C | 1[e] |
| 118741 | Hexachlorobenzene | 0.97 |
| 87683 | Hexachlorobutadiene | 0.88 |
| 67721 | Hexachloroethane | 0.499 |
| 110543 | Hexane | 1 |
| 78591 | Isophorone | 0.506 |
| 58899 | Lindane (all isomers) | 1 |
| 67561 | Methanol | 0.855 |
| 74839 | Methyl bromide (Bromomethane) | 1 |
| 74873 | Methyl chloride (Choromethane) | 1 |
| 71556 | Methyl chloroform (1,1,1-Trichloroethane) | 1 |
| 74884 | Methyl iodide (Iodomethane) | 1 |
| 108101 | Methyl isobutyl ketone (Hexone) | 0.979 |
| 624839 | Methyl isocyanate | 1 |
| 80626 | Methyl methacrylate | 0.999 |
| 1634044 | Methyl tert butyl ether | 1 |
| 75092 | Methylene chloride (Dichloromethane) | 1 |
| 91203 | Naphthalene | 0.994 |
| 98953 | Nitrobenzene | 0.394 |
| 79469 | 2-Nitropropane | 0.989 |
| 82688 | Pentachloronitrobenzene (Quintobenzene) | 0.839 |
| 87865 | Pentachlorophenol | 0.0898 |
| 75445 | Phosgene c | 1 |
| 123386 | Propionaldehyde | 0.999 |
| 78875 | Propylene dichloride (1,2-Dichloropropane) | 1 |
| 75569 | Propylene oxide | 1 |
| 75558 | 1,2-Propylenimine (2-Methyl aziridine) | 0.945 |
| 100425 | Styrene | 1 |
| 96093 | Styrene oxide | 0.83 |
| 79345 | 1,1,2,2-Tetrachloroethane | 0.999 |
| 127184 | Tetrachloroethylene (Perchloroethylene) | 1 |
| 108883 | Toluene | 1 |
| 95534 | o-Toluidine | 0.152 |
| 120821 | 1,2,4-Trichlorobenzene | 1 |
| 71556 | 1,1,1-Trichloroethane (Methyl chlorform) | 1 |
| 79005 | 1,1,2-Trichloroethane (Vinyltrichloride) | 1 |
| 79016 | Trichloroethylene | 1 |
| 95954 | 2,4,5-Trichlorophenol | 0.0108 |
| 88062 | 2,4,6-Trichlorophenol | 0.0132 |
| 121448 | Triethylamine | 1 |
| 540841 | 2,2,4-Trimethylpentane | 1 |
| 108054 | Vinyl acetate | 1 |
| 593602 | Vinyl bromide | 1 |
| 75014 | Vinyl chloride | 1 |
| 75354 | Vinylidene chloride (1,1-Dichloroethylene) | 1 |
| 1330207 | Xylenes (isomers and mixture) | 1 |
| 95476 | o-Xylenes | 1 |
| 108383 | m-Xylenes | 1 |
| 106423 | p-Xylenes | 1.000 |
Notes:
Fm 305 Fraction measure factor in Method 305, 40 CFR 305 part 63, appendix A.
a CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.
b Denotes a HAP that hydrolyzes quickly in water, but the hydrolysis products are also HAP chemicals.
c Denotes a HAP that may react violently with water.
d Denotes a HAP that hydrolyzes slowly in water.
e The Fm 305 factors for some of the more common glycol 305 ethers can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711.
[71 FR 69020, Nov. 29, 2006]